Question

I have 3 Thread Groups in my test plan.
These Thread Groups must be with fixed request weights (for example 1st-50%, 2nd-40%, 3rd-10%).
If I need to emulate constant number of users, the solution in this post which was given by @PMD UBIK-INGENIERIE works good if I set Loop Count as number (1, 10, 100 ect.). But the problem is when I set the check-box “forever” for Loop Counts, the proportion between groups is broken.

Now I need to increase the amount of users, saving proportion of requests between my 3 groups, to perform the capasity assessment.
All 3 groups must send requests evenly, in this constant proportion 50-40-10.

If I use Stepping Thread Group, I can evenly increase number of users in each of them, but I can’t set the proportion of request for them.

Could you please tell me any idea, how to do this?

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UPD1.

My screenshots with settings:

and

What is wrong?

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UPD2. The last variant (I have put numbers manually for each group) is (Thread Group1 – 50%):

Answer 1

The idea is the same as in PMD UBIK-INGENIERI’s answer.

1. Set USERS variable in User Defined Variables or test plan variables (or you can pass it through command line).
   Also set variables:

   PERCENT1 to 0.5
   PERCENT2 to 0.4
   PERCENT3 to 0.1
   

2. Add 3 stepping thread groups with:

“This group will start” set to

${__BeanShell(Math.round(${PERCENT1}*${USERS})}
${__BeanShell(Math.round(${PERCENT2}*${USERS})}
${__BeanShell(Math.round(${PERCENT3}*${USERS})}

“Then start” set to:

${__BeanShell(Math.round(${PERCENT1}*${USERS}/10)}
${__BeanShell(Math.round(${PERCENT2}*${USERS}/10)}
${__BeanShell(Math.round(${PERCENT3}*${USERS}/10)}

It will work if value of USERS variable can be divided by 100